8247522: assert(is_aligned(class_space_rs.base(), class_space_alignment)) failed: Sanity

Co-authored-by: Thomas Stuefe <thomas.stuefe@gmail.com>
Reviewed-by: stuefe, iklam

Author: DamonFool

src/hotspot/share/memory/metaspaceShared.cpp

@@ -2502,8 +2502,8 @@ char* MetaspaceShared::reserve_address_space_for_archives(FileMapInfo* static_ma
          "CompressedClassSpaceSize malformed: "
          SIZE_FORMAT, CompressedClassSpaceSize);
 
-  const size_t ccs_begin_offset = align_up(archive_space_size,
-                                           class_space_alignment);
+  const size_t ccs_begin_offset = align_up(base_address + archive_space_size,
+                                           class_space_alignment) - base_address;
   const size_t gap_size = ccs_begin_offset - archive_space_size;
 
   const size_t total_range_size =

test/hotspot/jtreg/runtime/cds/SharedBaseAddress.java

@@ -41,6 +41,7 @@ public class SharedBaseAddress {
         "1g", "8g", "64g","512g", "4t",
         "32t", "128t", "0",
         "1", "64k", "64M",
+        "0x800001000",        // Default base address + 1 page - probably valid but unaligned to metaspace alignment, see JDK 8247522
         "0xfffffffffff00000", // archive top wraps around 64-bit address space
         "0xfff80000",         // archive top wraps around 32-bit address space
         "0xffffffffffffffff", // archive bottom wraps around 64-bit address space -- due to align_up()

test/hotspot/jtreg/runtime/cds/appcds/SharedBaseAddress.java

@@ -41,7 +41,8 @@ public class SharedBaseAddress {
     private static final String[] testTable = {
         "1g", "8g", "64g","512g", "4t",
         "32t", "128t", "0",
-        "1", "64k", "64M", "320g"
+        "1", "64k", "64M", "320g",
+        "0x800001000"  // Default base address + 1 page - probably valid but unaligned to metaspace alignment, see JDK 8247522
     };
 
     public static void main(String[] args) throws Exception {